Loop aerial



Nov. 23 1926.

W. O. MEISSNER LOOP AERIAL Filed Dec. 18. 1925 Z mentor z ll lu'am/Ofile issue Patented Nov. 23, 1926.

WILLIAM ominssnnn, or CHICAGO, ILLINOIS.

LOOP AERIAL.

Application filed December This invention relates to improvements inloop aerial's, and more particularly to an improved method ofconstructing aerials of the character described.

The object of the invention is to provide an improved construction forloop aerials calculated to reduce the cost of production and toeliminate certain undesirable electrical effects common to loop aerialsas ordinarily constructed, and as will hereinafter be more fullyexplained.

A preferred embodiment of the invention is disclossed in theaccompanying drawings, in which Figure 1 is a View in side elevation ofthe completed aerial.

Figure 2 is an enlarged perspective view of a section of the aerialframe.

Figure 3 is an enlarged detail view in section taken on line 3-3 ofFigure 2,

Figure A is a perspective view of one of the discs, and

Figure 5 is a view showing the method of wiring.

A loop aerial, so-called, is one in which the antenna of a receiving setis brought within a relatively small compass, by winding a length ofantenna wire on a suitable frame in the form of a plurality of loops orturns. While an aerial of this type gives satisfactory results with setsdesigned for their use, it has been found that their effective-v ness isreduced bythe electrical phenomena, known as distributive capacity,which has been attributed to the fact that the turns of ing frame.Moreover, by the improved construction, the operation of winding hasbeen very muchsimplified and the time required greatly shortened.

Referring nowto the aerial as preferably constructed, the same consistsof a cincular frame 1, of the desired diameter of say lfi to 18 inches,aboutthe inner'periphery of which is wound a network of covered flexibleWire 2, in .thef rm f a band f ay 18,1925. serialno. 75,149.

two (2) inches in width. At one point on the frame is a supporting stem3, projecting are three such terminals or binding posts,

one of which is connected with a shuntterminal .or tap 8, electricallyconnected with the aerial wire at a point midway of its length to formwhat is known as a split loop, i As a preferable construction the frame1 is made of a strip of fibre or other non-conductive material bent intothe form of a hoop, the material being about one inch in width andone-eighth of an inch in thickness. Around the frame are formed aplurality of equidistantly spaced holes 9, located midway between theedges. These holes are punched out of the material and are about onequarter of an inch in diameter. Moreover, these holes are counter-sunkas shown in Figure 1, to form annular shoulders 9 shown as square,although they may be tapered if desired; The distance between holes,measured on the circumference of the frame, varies wlth the diameter ofthe frame and I made, thereare holes extending complete- 1y around theframe, and which include the ,two 'just abovethe terminal block and oneither side of the tap 8, in which are mounted terminals 1 O.and 11 forthe ends of the antenna wire. These holes are designated by numbers.Thus starting with the left hand terminal 10 as hole number 1, theholesare numbered consecutively around the-frame in a clockwise directionwith the right terminal as No.80. Having first connected the free end ofthe wire to'theterminal 10, it is fearried to hole'No. 15 ,then to No.29, then to No. 43,'then to No. 57, and then to No. 71.

At the last mentioned hole thewire has Pract cal y mad one comp rum ojth frame, passing from point to point with intervals of 14 holesbetween. Having reached hole No. 71, the next or 14th holebeyond is No.5 (A holes beyond No; 1), so that the first complete loop or turn,carries the wire four holes beyond its starting point where the secondturn is begun. the same spacing of ll holes between points ofattachment, the second turn of wire is secured atholes Noslt), 38, 47,61, consecutively. and thence to No. 9, for the beginning of the thirdturn. This method is continued with each succeeding turn, the wire beingdrawn taut so that each turn consists of six chords about the circle,although, as is evident, the arcs subtended by these chords are slightlygreater than a complete circle, the differential being thedistancebetween 4 holes. lVhen seven turns are applied, the last chord of theseventh turn is secured to the tap 8, and then the winding of the secondseven turns is commenced, this time using the even numberedholes insteadof the odd numbers. fhus, for the eighthturn, holes Nos. i l, 28, 4-2,56, 70, 4, etc. is the order in which the wire is threaded, finallyending at the end of th l ith turn with the left hand terminal 11. Thuson the completion of the winding a web-like network of wire is built upwithin the frame, forming a uniform design or pattern in which no twoturns or chords of any turns are parallel with each other.

Having described the arrangement or scheme of wiring, the methodfollowed in the actual operation will now be set forth. F or conveniencea rotative table may be used having a circular form in which the frameis held. At the center of the form is a spindle on which a spool of wireis mounted. The end of the wire being secured to one terminal, asalready described, the frame is turned as the wire is carried from holeto hole. to remain. in one position, instead of moving about the frame.In making a connection with the frame, the operator uses a suitableinstrument with a hooked end which he passes through the hole from theoutside, engaging and drawing a loop 2v of the wire outwardly throughthe hole as shown in Figure 5, and somewhat after. the manner ofcrocheting. This having been done, a

small circular disk 12 having diametrically opposed marginal notches 12is inserted through the loop of wire thus drawn through and thenceslippedinto the hole where it fitsjwithin the seat formed by thecountersunk shoulder, and flush with the outer surface of the frame(Figured). [The wire thjus passes outwardly through one notch. over-thedisc, and inwardly through the. other notch, and'thence to the nexthole, j where the same fastening is made, the wire being pulled tautasthe winding progresses Thus adheringto This, of course, permits theoperator from hole to hole. In each instance the discs are disposed withthe notches in alignment with each other, the loops over the discs beinglikewise in the same circumfeu ential line. As the winding progresses,the wire is unwound from the spool which remains in one position, sincethe feeding of the wire is entirely from the inner side of the frame,and hence the winding proceeds rapidly and without confusion.

h lanifestlythe exact form'of loop securing members, the arrangement ofthe turns or wire and the method ofv wiring may differ from that hereinillustrated and described without departing from the spirit of theinvention, and therefore I do not wish to be limited to-the specificdisclosure, except in so far as set forth in the appended claims.

I claim as my invention:

1. A loop aerial comprisinga circular frame, provided with a pluralityof holes spaced around said frame, and an antenna wire supported by saidframe, and consisting of a plurality of turns attached to the frame atpredetermined points about its circumference, each point of attachmentconsisting of a hole through which a loop of wire is drawn and afastening .member passing through said loop and bearing against saidframe.

2. A loop aerial comprising a circular frame, and an antenna wiresupported by said frame and consisting of a series of turns fixed to theframe at a series of predetermined points about its circumference, therebeing a hole formed at each of said points through which loops of saidwire are drawn from one side of said frame'and fastening members adaptedto be inserted through said loops on the opposite side of said frame.

3. .loop aerial comprising a circular frame, and an antenna wiresupported by said frame and consisting of a series of said points,through which a loop of said wire is drawn outwardly, and a fasteningmember passing through each loop and seating over said hole, and theoutside of said frame.

A loop aerial comprising a circular frame, andan antenna, wire supportedby said frame and consisting of a series of turns fined to the frame ata series of predetermined points about. its circumference, there being ahole formed at each of said points through which loops ofsaid wireproject, and fastening members adapted to seat within said holes, overwhich said loops p 5. A loop aerial comprising a circular frame, and anantenna wire supported by said" frame and consisting of a series ofturns each fixed to the frame at a series of predetermined points aboutits circumference, there being a hole formed at each of said points intowhich loops of said Wire extend and circular discs provided Withoppositely disposed notches, adapted to seat Within said holes andhaving portions on opposite sides removed to permit said loops to passover said discs.

6. A loop aerial comprising a frame consiting of relatively thinmaterial having a plurality of relatively large holes extend ing aroundits circumference, and an antenna Wire consisting of a series of turnseach secured to said frame at predetermined holes spaced apartequidistantly; by passing looped portions of said Wire through saidholes and means for securing said looped portions in substantially thesame circumferential line. Y

7. A loop aerial comprising a strip of relatively pliable materialshaped in circular form, and provided throughout its circumference Witha plurality of equidistantly spaced holes a plurality of discs providedwith oppositely disposed marginal notches adapted to seat within saidholes, and an antenna Wire supported within said frame and consisting ofturns secured at said holes by extending looped portions therethrough,

and discs adapted to seat Within said holes and to extend through saidlooped portions of the Wire.

8. A method of constructing a loop aerial consisting of bending a stripof relatively thin material having a plurality of relati vely largeholes extending lengthwise, into circular form; mounting a spool ofantenna Wire at the center of said frame, and attaching said Wire atsuccessive points around said frame, by imposing loops through a hole ateach successive point from the inside of said frame, inserting afastening member through each loop'on the outside of said frame anddrawing the Wire taut after each loop has been fastened.

9. A method of construcing a loop aerial consisting of bending a stripof relatively pliable material provided throughout its length With aplurality of equidistantly spaced holes into circular form, providing aplurality of discs adapted to seat Within said holes, and Winding turnsof an antenna Wire around said frame by passing successive loopedportions of said wire through said holes and inserting said discsthrough said looped portions. 7

Signed at Chicago, 111., this 14th day of December, 1925.

l/VILLIAM O. MEISSNER.

